XCRYPTSection: Linux Programmer's Manual (3)
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NAMExencrypt, xdecrypt, passwd2des - RFS password encryption
void passwd2des(char *passwd, char *key);
int xencrypt(char *secret, char *passwd);
DESCRIPTIONThe function passwd2des() takes a character string passwd of arbitrary length and fills a character array key of length 8. The array key is suitable for use as DES key. It has odd parity set in bit 0 of each byte. Both other functions described here use this function to turn their argument passwd into a DES key.
The xencrypt() function takes the ASCII character string secret given in hex, which must have a length that is a multiple of 16, encrypts it using the DES key derived from passwd by passwd2des(), and outputs the result again in secret as a hex string of the same length.
RETURN VALUEThe functions xencrypt() and xdecrypt() return 1 on success and 0 on error.
VERSIONSThese routines are present in libc 4.6.27 and later, and in glibc 2.1 and later.
BUGSThe prototypes are missing from the abovementioned include file.
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.